die Brustwarze
nipple
The small, raised, and often darker-colored area in the center of the human breast in men and women.
Bei Kälte ziehen sich die Brustwarzen zusammen.
In the cold, the nipples contract.

nipple / teat
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nipple
The small, raised, and often darker-colored area in the center of the human breast in men and women.
Bei Kälte ziehen sich die Brustwarzen zusammen.
In the cold, the nipples contract.

This word is made up of 'die Brust' (the breast/chest) and 'die Warze' (the wart). So the meaning is literally a 'wart on the breast.'
Das Baby hatte Schwierigkeiten, die Brustwarze richtig zu fassen.
The baby had trouble latching onto the nipple properly.
You can tell from the context whether the human nipple or the nipple of a baby bottle is meant. Words like 'Baby' (baby), 'Flasche' (bottle), or 'Sauger' (teat/nipple) point to the second meaning, while contexts about the human body point to the first meaning.
Die Brustwarze der Flasche hat ein zu großes Loch.
The nipple of the bottle has too large a hole.
In connection with the human body, 'Brustwarze' (nipple) is often used with adjectives like 'empfindlich' (sensitive) or 'gereizt' (irritated), or with verbs like 'sich verhärten' (to harden).
Nach dem Sonnenbrand waren ihre Brustwarzen sehr empfindlich.
After the sunburn, her nipples were very sensitive.
nipple
'Nippel' and 'Brustwarze' can both refer to the small area in the center of the human breast or chest. 'Brustwarze' is the precise and neutral word for this, especially at the doctor or in factual conversations. 'Nippel' is used colloquially for the nipple, but it can also mean a teat in animals. In addition, 'Nippel' has a completely different meaning in technology: a small connecting or attachment piece. Learners may confuse the words because 'Nippel' is used like 'Brustwarze' in some situations. If you want to speak clearly and neutrally, 'Brustwarze' is usually the better choice.

Nach dem Gespräch hat meine Schwester wegen Schmerzen an der Brustwarze einen Arzttermin gemacht.
After the conversation, my sister made a doctor's appointment because of pain in her nipple.
Beim Fahrrad war ein kleiner Nippel an der Speiche locker.
On the bicycle, a small spoke nipple was loose.